I'm not sure I have a good answer for you Keith, but in my case my end goal when out shooting is creating compelling images that can be displayed at large sizes so the process of printing big begins when leaving for a shoot. As such even when shooting I'm always using the maximum resolution device I can carry and even with my 100mp back I'm stitching whenever the scene allows it. While many images don't make the "cut" as it were, I don't know this when shooting and I've been burned too many times creating a nice image with less than adequate tools.
As I work on the images I determine if I've met the goal, and through the process images which succeed go through a series of 3 test prints, first 13x19, then 17x22 on fine art paper (currently favorite is Epson Baryta), and finally 24x30 Fine art paper. Even though I get a nice match from display to paper, there is something about how your eye interprets the print which might make something on print look unfavorable, and despite trying hard it's amazing how often something very "small" ends up obvious on the printed image. Admittedly this work flow isn't for everyone. To be honest I'm usually happy if I get one or two "keepers" from any shoot, and I'm pretty happy if I can add 20 or so images to my portfolio in a year.
Once I print the 24x30 and examine it closely, I then determine how large I feel it can be printed, and categorize the image based on several factors, mostly personal based on my decisions as the "artist" if you will. I have 3 "categories" which determine the available sizes and the price range of the images. the category is entirely my decision. While I might seek some input from a trusted friend who is a very talented photographer, I personally do not seek any input from customers. I also do not enter "contests" or engaged in other types of feedback. I just feel I'm the artist and if my choices as an artist are poor then perhaps I'm not much of an artist.
If the image has appeal but perhaps doesn't lend itself to being printed large (subject matter, not enough resolution, etc) then it might be offered as an accent type print at sizes from 13x19 up to 24x30. If I determine it is be offered at larger sizes I examine the test print a little closer, and will perhaps work on the image a little further. Images which I feel represent my best work both artistically and technically end up in a category with a smaller edition size and a minimum print size of 42" on the long dimension.
Even after all of that examination, after printing a large print (my sizes range from 42" to 85") I often will find small flaws on the final print, so a careful examination of the print often requires me to do some additional work on the file(missed camera spot, sometimes a mask needs tweaking because of a halo, things like that). The biggest challenge I've had is getting the same "pop" from the image once it is printed large that it appears to have on the display or even in the 24x30 test print. I've found that I often need to add a tiny bit of density and contrast, and perhaps even a little saturation to the image. I've also had images which looked fine small but some areas tended to look "muddy" for lack of a better word in the large print, required some adjustment brush work to optimize them. It's not uncommon that I have to work the file further when printing the first large print, especially if it's a 74 or 85" size.
Good luck with your presentation.
